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Subject: [Pljava-dev] VarLenTuple example code
Date: Thu, 28 Sep 2006 16:25:34 +0200
Message-ID: <451BDB5E.1020107@tada.se> (raw)
In-Reply-To: <451BD650.2080201@logix-tt.com>
References: <451BD0B1.8000408@logix-tt.com>
	<451BD2F4.60202@tada.se>
	<451BD650.2080201@logix-tt.com>

Markus Schaber wrote:
> Hi, Thomas,
>
> Thomas Hallgren wrote:
>   
>> Hmm, perhaps just an oversight, bot you don't have UDT syntax on the
>> send/receive methods, i.e. this line:
>>
>> +            AS 'org.postgresql.pljava.example.VarLenTuple.receive'
>>
>> should read
>>
>> +            AS 'UDT[org.postgresql.pljava.example.VarLenTuple] receive'
>>     
>
> That was intentional, as I wanted the customary written send and receive
> methods to be called (and not those from UDT.c) as I want the
> send/receive binary format [type B)] in a platform independent
> big-endian format, different from the internal one [type C)].
>
> Declaring those methods without UDT[] magic was the way I hoped to
> achieve that, according to how I understood our discussion.
>
>   
No, in that case you must have misunderstood. When you do that, you 
remove the middleman that sets up the correct SQLData semantics. The 
send/receive functions in PostgreSQL maps to the readSQL/writeSQL 
methods in SQLData. The readSQL is the method that supposedly populate 
your VarLenTuple from the byte buffer native presentation (wrapped in 
the SQLInput). The writeSQL creates the native presentation byte buffer 
(wrapped in the SQLOutput) from the VarLenTuple. There's absolutely no 
need for you to create some other send/receive mechanism in Java.

Regards,
Thomas Hallgren

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